SP335E_17 Datasheet, PDF (19/23 Pages) Exar Corporation – TRANSCEIVER WITH INTERNAL TERMINATION

SP335E
REV. 1.0.2
RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
TRUTH TABLES
TABLE 1: RS-232 TX TRUTH TABLE
INPUTS
OUTPUTS
SHDN
RS-485/RS-232
DI/T1IN, DE/T2IN
Z(B)/T1OUT, Y(A)/T2OUT
0
X
X
1/8th unit load
1
0
0
1
1
0
1
0
1
1
X
RS-485 Mode
TABLE 2: RS-232 RX TRUTH TABLE
INPUTS
SHDN
RS-485/RS-232
X
0
X
0
X
0
X
1
B/R1IN, A/R2IN
0
1
Inputs open
X
OUTPUTS
R1OUT, RO/R2OUT
1
0
1
R1OUT High-Z,
RO/R2OUT in RS-485 Mode
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